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Finding the Fourth Proportional to 691.83, 1,037.79 and 405.09

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Solution

The fourth proportional to 691.83, 1,037.79 and 405.09 is: 607.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.83 : 1,037.79 = 405.09 : x
  2. Step 2: Convert to fraction form
    691.83/1,037.79 = 405.09/x
  3. Step 3: Cross multiply
    691.83x = 1,037.79 × 405.09
  4. Step 4: Simplify right side
    691.83x = 420,398.35
  5. Step 5: Solve for x
    x = 420,398.35/691.83
  6. Step 6: Final answer
    x = 607.66

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.